A cold front moved through the region during the late afternoon and evening.  This cold front, combined with moist and unstable conditions, triggered widespread showers and storms across the region.  The strongest of these storms downed trees and powerlines, as well as producing very large hail.  Intense lightning caused fires and several personal injuries.  Torrential rainfall flooded a few areas, and was also responsible for sweeping away a young boy.  Damage estimates by print media were in the hundreds of thousands, possibly more.

Thunderstorm Wind in FREDERICK, MARYLAND
From 27-JUL-05 16:06:00 to 27-JUL-05 16:06:00 (EST)
Location: WOLFSVILLE
Magnitude: 50 EG
Reported by: EMERGENCY MANAGER

Trees and powerlines were downed.

Thunderstorm Wind in WASHINGTON, MARYLAND
From 27-JUL-05 15:42:00 to 27-JUL-05 15:42:00 (EST)
Location: FAIR PLAY
Magnitude: 50 EG
Reported by: EMERGENCY MANAGER

Trees were downed.

Hail in MONTGOMERY, MARYLAND
From 27-JUL-05 16:45:00 to 27-JUL-05 16:50:00 (EST)
Location: LAYTONSVILLE
Magnitude: 1.75 
Reported by: GENERAL PUBLIC

Lightning in MONTGOMERY, MARYLAND
From 27-JUL-05 16:45:00 to 27-JUL-05 16:55:00 (EST)
Location: NORTHWEST PORTION
Reported by: EMERGENCY MANAGER

Lightning sparked fires and caused several house fires in the northwest portion of the county.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 27-JUL-05 16:45:00 to 27-JUL-05 17:25:00 (EST)
Location: NORTHWEST PORTION
Magnitude: 60 EG
Reported by: EMERGENCY MANAGER

A few trees and power lines were downed across the Northwest portion of the county.  This high wind event spread southeast across the county. The Emergency Operations Center received hundreds of calls of trees and power lines down during this event.  Many trees and power lines were also downed in Silver Spring and Wheaton.  A few of these were blown onto personal houses.  Also in Silver Spring, a tree collapsed onto power lines and caved in the roof of a car.  A home was damaged by storm debris in Chevy Chase, Maryland.

Strong Wind in ANNE ARUNDEL, MARYLAND
From 27-JUL-05 17:00:00 to 27-JUL-05 17:00:00 (EST)
Magnitude: 30 EG
Reported by: NEWSPAPER

Two people (a 60 year old man and his 4 year old grand daughter) were rescued from the Chesapeake Bay near Herring Bay by the Coast Guard.  The pair had strayed from their boat during an evening swim. The man later died of an apparent heart attack.  The young girl was treated for hypothermia.  Local reports from the Coast Guard and newspaper stated that rough seas and gusty winds may have contributed to the accident, although it was unclear what exactly occurred.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 27-JUL-05 17:40:00 to 27-JUL-05 17:40:00 (EST)
Location: COLLEGE PARK
Magnitude: 50 EG
Reported by: GOVT OFFICIAL

Trees were downed in College Park, Lanham, and Bowie.

Lightning in ANNE ARUNDEL, MARYLAND
From 27-JUL-05 18:00:00 to 27-JUL-05 18:00:00 (EST)
Location: PASADENA
Property damage: 450K
Reported by: NEWSPAPER

A lightning strike sparked a two-alarm fire at a Pasadena marina, destroying a boat. Flames caused significant damages to the boat, a neighboring boat, and also the pier area in general.

Lightning in BALTIMORE CITY (C), MARYLAND
From 27-JUL-05 17:30:00 to 27-JUL-05 17:30:00 (EST)
Location: BALTIMORE
Reported by: NEWSPAPER

Lightning ignited a few fires in the city and damaged the chimney of a local civic organization.

Thunderstorm Wind in HARFORD, MARYLAND
From 27-JUL-05 17:32:00 to 27-JUL-05 17:32:00 (EST)
Location: HICKORY
Magnitude: 50 EG
Reported by: FIRE DEPT/RESCUE SQUAD

Numerous trees were downed near Hickory, Maryland.  Trees and power lines were downed countywide.   Also, a tree landed on a car located on Chestnut Hill Road.

Lightning in PRINCE GEORGE'S, MARYLAND
From 27-JUL-05 17:40:00 to 27-JUL-05 17:40:00 (EST)
Location: LAUREL
Reported by: GOVT OFFICIAL

Lightning sparked a fire on the roof of a Laurel office building.  Significant damages were reported.

Thunderstorm Wind in HOWARD, MARYLAND
From 27-JUL-05 17:45:00 to 27-JUL-05 17:45:00 (EST)
Location: CLARKSVILLE
Magnitude: 50 EG
Reported by: GOVT OFFICIAL

Trees were downed on Brighton Dam Road near the Montgomery County Line.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 27-JUL-05 17:25:00 to 27-JUL-05 17:30:00 (EST)
Location: WOODLAWN
Magnitude: 55 EG
Reported by: FIRE DEPT/RESCUE SQUAD

Trees were downed in Woodlawn and Parkville.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 27-JUL-05 17:30:00 to 27-JUL-05 17:30:00 (EST)
Location: BALTIMORE
Magnitude: 50 EG
Reported by: GOVT OFFICIAL

Trees were downed on Falls Road at Bellmore in the northern part of the city.

Thunderstorm Wind in HARFORD, MARYLAND
From 27-JUL-05 17:48:00 to 27-JUL-05 17:48:00 (EST)
Location: ABERDEEN
Magnitude: 50 EG
Reported by: FIRE DEPT/RESCUE SQUAD

Treed were downed.

Thunderstorm Wind in CARROLL, MARYLAND
From 27-JUL-05 17:45:00 to 27-JUL-05 17:45:00 (EST)
Location: WESTMINSTER
Magnitude: 50 EG
Reported by: NEWSPAPER

A tree fell on a power line on Marston Road which is located near New Windsor.  Another tree was downed on Sandymouth Road, which is located north of Maryland State Route 140.  This information was compiled through local print media information.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 27-JUL-05 18:00:00 to 27-JUL-05 18:00:00 (EST)
Location: GLEN BURNIE
Magnitude: 50 EG
Reported by: EMERGENCY MANAGER

Trees and powerlines downed at several locations.

Thunderstorm Wind in FREDERICK, MARYLAND
From 27-JUL-05 16:45:00 to 27-JUL-05 16:50:00 (EST)
Location: LIBERTYTOWN
Magnitude: 50 EG
Reported by: EMERGENCY MANAGER

Trees and powerlines downed.